Re: lockable axles
The cable that runs out of the diff hooks to a servo so you can lock and unlock the diff as needed.
If you're asking about inner workings, check out Axial wraith and Traxxas summit / trx4 since they have that feature.
Most locked axles just run a spool. These selectable ones generally use a spring loaded collar that moves locking pins across the spider carrier into holes in the other side.
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What do ya mean "Cars are neither Trucks or Construction"?
It's still scale, and i play fairly well with others, most of the time...
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